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Side effects
Anaemia and Low Haemoglobin — During Targeted Therapy
Low haemoglobin during targeted therapy means your blood is carrying less oxygen than it should. Mild anaemia is common and manageable at home. Breathlessness at rest, chest pain, or dizziness that stops you standing safely are not — those need same-day review.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- Common, but gradable — Most anaemia during targeted therapy is mild and does not require stopping treatment.
- Symptoms matter as much as the number — How you feel — especially breathlessness and dizziness — tells you as much as a blood test result.
- Do not self-prescribe iron — Iron supplements are not always indicated and can interfere with some targeted therapies. Ask your team first.
- Never stop treatment yourself — If tiredness is severe, call your team. Stopping targeted therapy without guidance can affect how well it works.
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Low haemoglobin during targeted therapy is anaemia — your blood is carrying less oxygen than it should. Many targeted therapies cause this directly. Mild anaemia is manageable at home with rest and diet. Breathlessness at rest, chest pain, a racing heartbeat, or dizziness that stops you standing safely are signs to seek same-day medical care.
If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.
What can you do at home for mild anaemia?
- Rest when you feel tired. Short rest periods through the day are better than staying in bed all day.
- Pace your activities. Do the most important tasks when your energy is highest, usually in the morning.
- Include iron-containing foods at each meal: dark leafy greens, lentils, beans, eggs, and fortified cereals.
- Pair iron-rich foods with vitamin C — a squeeze of lemon juice or a small portion of tomatoes helps absorption.
- Avoid tea, coffee, and milk immediately after meals — they reduce how much iron your body absorbs.
- Stay hydrated. Dehydration makes the sensation of tiredness and dizziness worse.
- Keep a daily note of your energy level, any breathlessness, and any dizziness. Bring it to your next appointment.
- Do not take iron tablets or supplements without asking your oncology team first.
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MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
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Dr. Mohammed Imran
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MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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How do you grade what you are feeling?
| Feature | Manage at home | Call your team today |
|---|---|---|
| Breathlessness | Only with significant effort — climbing stairs, rushing | With everyday tasks such as dressing, or at rest |
| Dizziness | Brief lightheadedness when standing, passes quickly | Persistent, or makes you feel you might fall |
| Heart rate | Normal | Racing, pounding, or irregular when sitting still |
| Pallor | You look pale to others | Lips or fingernails turning blue or grey |
| Energy level | Tired but able to carry out basic self-care | Unable to get out of bed or care for yourself |
| Typically starts | Anaemia builds gradually over weeks of treatment — not all at once | Any rapid worsening over a day or two is a reason to call, not wait |
Your questions about anaemia and targeted therapy
Why does targeted therapy cause low haemoglobin?
Different targeted therapies affect haemoglobin through different mechanisms. Some suppress the bone marrow, reducing how many red blood cells your body produces. Others cause low-grade internal bleeding — drugs that affect blood vessel growth can cause small bleeds in the gut. Some affect how efficiently your kidneys signal to the bone marrow to make new red cells. Your oncologist can explain which mechanism applies to your drug, because the cause affects which treatment is most appropriate for you.
Will my targeted therapy have to stop?
Not necessarily, and for mild or moderate anaemia it usually does not. Your oncologist weighs how well the treatment is working against the severity of the side effect. Mild anaemia is typically monitored with more frequent blood tests while treatment continues. More severe anaemia may require a dose adjustment, a temporary pause, or a blood transfusion to bring your levels up before restarting. Stopping targeted therapy yourself — rather than under guidance — is not the right response to tiredness.
Should I take iron tablets or supplements?
Ask your team before taking anything. Not all anaemia during targeted therapy is caused by iron deficiency. If your anaemia is caused by reduced red cell production or internal bleeding rather than low iron stores, iron tablets will not help and may cause side effects. Some targeted therapies also interact with supplements. Your team can check your iron stores with a simple blood test and recommend supplementation only if it is actually indicated for your situation.
How is severe anaemia treated?
Severe anaemia that is causing symptoms is usually treated with a blood transfusion, given as a day-care infusion that brings haemoglobin up within hours. Your oncologist may also adjust your targeted therapy dose, treat an underlying cause such as bleeding, or add a medication to stimulate red cell production if that is appropriate. The right approach depends on what is causing the anaemia, how symptomatic you are, and whether you have other conditions that affect which options are safe.
When will my haemoglobin return to normal?
It varies. If the anaemia is caused by the targeted therapy itself, haemoglobin often stabilises at a lower-than-normal level while treatment continues, then gradually recovers after treatment ends. A blood transfusion brings levels up quickly but does not fix the underlying cause — the cause still needs to be managed. Your oncologist will monitor your blood counts regularly and can tell you what trend they expect for your specific situation. We do not yet fully understand why some patients recover more quickly than others.
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Common questions
Frequently asked questions
How will I know my haemoglobin is low if I have not had a blood test?
You may not know with certainty — and that is why blood tests at each cycle matter. Symptoms that suggest low haemoglobin include unusual tiredness, shortness of breath with activities you could do comfortably before, looking pale, feeling dizzy when you stand, and a heartbeat that feels faster than normal. None of these are unique to anaemia, but any new or worsening combination is a reason to contact your team rather than wait for your next scheduled appointment.
Can eating well reverse my anaemia?
Diet can support your body's ability to make red blood cells, but it cannot reverse anaemia caused by bone marrow suppression or internal bleeding. Iron-rich foods — pulses, dark leafy greens, fortified cereals — and vitamin C eaten alongside them help when iron deficiency is part of the picture. What diet cannot do is compensate for severe anaemia or for an ongoing cause that needs medical treatment. Tell your team what you are eating so they can advise what is actually likely to help in your situation.
Is my tiredness from anaemia or from the targeted therapy itself?
Often both. Targeted therapy can cause fatigue directly, independent of haemoglobin levels, and anaemia adds to that. The distinction matters because anaemia is treatable — correcting it improves the fatigue that comes from it — while fatigue from the therapy itself is managed differently, through pacing, sleep, and activity management. Your team can check your blood count to see how much of the tiredness may be coming from the haemoglobin level and advise you from there.
Will a blood transfusion mean a hospital admission?
Usually not. Transfusions are typically given as day care — you come in, receive the infusion over a few hours, and go home the same day. You will be monitored throughout. The exception is if you are very unwell or have other complications that require overnight observation. Your team will tell you how long to expect to be there and what to bring with you.
Should I stop my targeted therapy if I feel very tired?
No — call your team instead. Stopping targeted therapy without guidance can affect how well it continues to work and may not be necessary. Tiredness alone, unless it is preventing you from caring for yourself or is accompanied by the red-flag symptoms listed above, is usually managed by treating the anaemia rather than stopping treatment. Your oncologist needs a blood test result and your symptom picture to make the right call. That call takes a few minutes; stopping treatment without it is a decision you cannot easily undo.